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| author | Andi Kleen <ak@suse.de> | 2006-01-27 02:03:50 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-01-31 18:00:13 -0800 |
| commit | 3103039cc2a8dc6ababc29afac5c3cadbfa69af9 (patch) | |
| tree | f89e6a1ca25281fbf78f6438c0463d06251ae3a3 /arch/x86_64/pci | |
| parent | 877be3f0304de16a77f11b2b47f1291b800d5479 (diff) | |
| download | linux-3103039cc2a8dc6ababc29afac5c3cadbfa69af9.tar.gz linux-3103039cc2a8dc6ababc29afac5c3cadbfa69af9.tar.bz2 linux-3103039cc2a8dc6ababc29afac5c3cadbfa69af9.zip | |
[PATCH] PCI: handle bogus MCFG entries
Handle more bogus MCFG entries
Some Asus P4 boards seem to have broken MCFG tables with
only a single entry for busses 0-0. Special case these
and assume they mean all busses can be accessed.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/x86_64/pci')
| -rw-r--r-- | arch/x86_64/pci/mmconfig.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c index f16c0d57c552..00d4ddbf980c 100644 --- a/arch/x86_64/pci/mmconfig.c +++ b/arch/x86_64/pci/mmconfig.c @@ -29,11 +29,8 @@ static char __iomem *get_virt(unsigned int seg, unsigned bus) while (1) { ++cfg_num; - if (cfg_num >= pci_mmcfg_config_num) { - /* Not found - fall back to type 1. This happens - e.g. on the internal devices of a K8 northbridge. */ - return NULL; - } + if (cfg_num >= pci_mmcfg_config_num) + break; cfg = pci_mmcfg_virt[cfg_num].cfg; if (cfg->pci_segment_group_number != seg) continue; @@ -41,6 +38,18 @@ static char __iomem *get_virt(unsigned int seg, unsigned bus) (cfg->end_bus_number >= bus)) return pci_mmcfg_virt[cfg_num].virt; } + + /* Handle more broken MCFG tables on Asus etc. + They only contain a single entry for bus 0-0. Assume + this applies to all busses. */ + cfg = &pci_mmcfg_config[0]; + if (pci_mmcfg_config_num == 1 && + cfg->pci_segment_group_number == 0 && + (cfg->start_bus_number | cfg->end_bus_number) == 0) + return cfg->base_address; + + /* Fall back to type 0 */ + return 0; } static char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned int devfn) |